This effect can be enabled if you are the host of the XBox Live game. To enable press 'Start' as host and then hold LB, Left Stick (x2), A, Right Stick (x2), B, Left Stick (x2), X, Right Stick (2), Y.

Use the mic in single player. If you keep the mic plugged in then you can issue voice commands to your team, saves you having to take your finger of the trigger! Whatever Keller says, you say into the mic, the team do it, as if you had pressed the button.

During gameplay open the 'Pause' menu and hold the Left shoulder button and enter the following codes to unlock the corresponding effect.

Increase Ragdoll Strength:
A, A, B, B, X, X, Y, Y, A, B, X, Y.

Unlock 3rd Person View:
Press X, B, X, B, Left Thumbstick, Left Thumbstick, Y, A, Y, A, Right Thumbstick, Right Thumbstick.

Change Bullet Tracers Colour:
Left Thumbstick, Left Thumbstick, A, Right Thumbstick, Right Thumbstick, B, Left Thumbstick, Left Thumbstick, X, Right Thumbstick, Right Thumbstick, Y.

Unlock One Hit Kills Mode:
Left Thumbstick, Right Thumbstick, Left Thumbstick, Right Thumbstick, A, B, Left Thumbstick, Right Thumbstick, Left Thumbstick, Right Thumbstick, X, Y.

Unlock Big Head Mode:
B, X, A, Y, Left Thumbstick, Y, A, X, B, Right Thumbstick.

When you play the Fremont Street level look for a ledge on one of the buildings that has a bottle of Axe cologne. When you shoot the bottle the neon roof of the Fremont Street Experience will change to an animation of a girl in a bikini promoting Axe items. This sequence is then followed by a sequence with outtakes and early animations.

Achieve the following ranks to unlock the correspondng items

Private 2nd Class:
All Starting Equiptment. Sergeant (Tactical Armor):
Raven Recon Armor, Vulture Combat Armor, Falcon Assault Armor.

Sergeant Major (Black Market Armor):
Typhoon Recon Armor, Cyclone Combat Armor, Hurricane Assault Armor.

Major (Military Armor):
Vier Recon Armor, Diamondback Combat Armor, Anaconda Assault Armor.

Corporal (Camo 1):
Desert, Urban, Russian, Guerrilla, Fall, Desert 2

Sergeant First Class (Camo 2):
Flecktarn, Orange, Swedish, War2k5, Alpen, White.

2nd Lieutenant (Camo 3):
Pink, Blue, Woodland, Wasp, Sand, Crimson.

Lt. Colonel (Camo 4):
Yellow Urban, Red Urban, Tiger, Rust, Urban 2, Grey

Elite (Camo 5):
Custom 1, Custom 2, Custom 3

Master Sergeant (Freedom Fighter Weapons):
AK47, Raging Bull, SV98

Private 1st Class (Headgears 1):
Tactical Helm, Balaclava.

Staff Sergeant (Headgears 2 - 3):
Hole Balaclava, Baseball Cap, Breathing Mask.

First Sergeant (Headgears 3):
Bonnie Hat, Beret, Tinted Goggles

1st Lieutenant (Headgears 4):
Half-Face Mask, Reinforced Helm, Tactical Goggles.

Colonel (Headgears 5):
Ballistic Face Mask, Riot Helm, NVGs

Captain (Merc Weapons):
MG36, SPAS12, Deagle

Specialist (Rainbow Weapons):
MP7A1, SIG552, USP40

Complete the following tasks to get the corresponding EXP. EXP can be earned in both Ranked or Player matches.

Black Market Armor - 139000 EXP:
Typhoon Recon Armor, Cyclone Combat Armor, Hurricane Assault Armor Achieve the rank of Sergeant Major.

Rainbow Weapons - 8400 EXP:
MP7A1, SIG552, USP40
Achieve the rank of Specialist

Camo 1 - 14500 EXP:
Desert, Urban, Russian, Guerrilla, Fall, Desert 2
Achieve the rank of Corporal.

Camo 2 - 56500 EXP:
Flecktarn, Orange, Swedish, War2k5, Alpen, White
Achieve the rank of Sergeant First Class.

Camo 3 - 172000 EXP:
Pink, Blue, Woodland, Wasp, Sand, Crimson
Achieve the rank of 2nd Lieutenant.

Camo 4 - 425000 EXP:
Yellow Urban, Red Urban, Tiger, Rust, Urban 2, Grey
Achieve the rank of Lt. Colonel.

Camo 5 - 675000 EXP:
Custom 1, Custom 2, Custom 3
Achieve the rank of Elite.

Headgears 1 - 3000 EXP:
Tactical Helm, Balaclava
Achieve the rank of Private 1st Class

Headgears 2 - 38500 EXP:
3 Hole Balaclava, Baseball Cap, Breathing Mask
Achieve the rank of Staff Sergeant

Headgears 3 - 109500 EXP:
Bonnie Hat, Beret, Tinted Goggles
Achieve the rank of First Sergeant

Headgears 4 - 214000 EXP:
Half-Face Mask, Reinforced Helm, Tactical Goggles
Achieve the rank of 1st Lieutenant

Headgears 5 - 535000 EXP:
Ballistic Face Mask, Riot Helm, NVGs
Achieve the rank of Colonel

Merc Weapons - 264000 EXP:
MG36, SPAS12, Deagle
Achieve the rank of Captain

Military Armor - 330000 EXP:
Vier Recon Armor, Diamondback Combat Armor, Anaconda Assault Armor
Achieve the rank of Major

Freedom Fighter weapons - 82500 EXP:
AK47, Raging Bull, SV98
Achieve the rank of Master Sergeant

Tactical Armor - 23500 EXP:
Raven Recon Armor, Vulture Combat Armor, Falcon Assault Armor
Achieve the rank of Sergeant